Method of blow-molding biaxially-oriented polyethylene terephtha

Details Method of blow-molding biaxially-oriented polyethylene terephtha Method of blow-molding biaxially-oriented polyethylene terephtha

1994-10-24

1995-08-29

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264530, 425526, B29C 4918, B29C 4964

Patent

active

054457840

ABSTRACT:
A biaxially oriented polyethylene terephthalate resin bottle-shaped container, and method of blow molding the same by heating the body portion of a preform at 90.degree. C. to 130.degree. C., biaxial-orientation blow-molding the preform in a primary blowing mold heated at 110.degree. C. to 230.degree. C. to form a primary intermediate molded bottle-shaped piece, heating the primary intermediate molded bottle-shaped piece at 130.degree. C. to 255.degree. C. or at a temperature which is 20.degree. C. or higher than the primary blowing mold temperature to form a secondary intermediate molded bottle-shaped piece, and blow-molding the secondary intermediate molded bottle-shaped piece in a secondary blowing mold heated at 100.degree. C. to 150.degree. C. to form a bottle-shaped container. The temperature of the secondary blowing mold is several degrees greater than the maximum temperature the molded bottle-shaped container will be subjected to during use. The bottle-shaped container has no stress remaining from biaxial orientation blow-molding and has a high heat resistance temperature value.

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